Multi-output power supply apparatus enhancing a power imbalance between multiple outputs

A multi-output power supply apparatus comprising:

• a power supply unit switching input power to output a plurality of voltages whose power levels are determined according to a switching operation;
• and
• a controller detecting power states of at least some of the plurality of voltages from the power supply unit, and limiting a range of a switching duty of the power supply unit to a pre-set range when the detected power states correspond to a pre-set limited power state,
• wherein the controller comprises:
• a duty range limiting unit comprising a maximum/minimum value controller setting a maximum value and a minimum value of a pulse signal according to a control signal indicating that states of some voltages correspond to the limited power state, and a duty controller limiting a duty range of the pulse signal according to the maximum value and the minimum value from the maximum/minimum value controller,
• wherein the duty controller comprises:
• a comparator comparing a pre-set reference voltage with a detected power state;
• a comparator group including a plurality of comparators comparing a comparison result from the comparator with the maximum value and the minimum value, respectively;
• and
• a switch group including a plurality of switches switching a signal path to provide a corresponding signal according to the comparison result from the comparator and the comparison results from the plurality of comparators of the comparator group.

A multi-output power supply apparatus comprising:

• a power supply unit switching input power to output a first power and a second power whose power levels are determined according to a switching operation;
• and
• a controller detecting a power state of the second power from the power supply unit, and limiting a range of a switching duty of the power supply unit to a pre-set range when the detected power state corresponds to a pre-set limited power state,
• wherein the controller comprises:
• a duty range limiting unit comprising a maximum/minimum value controller setting a maximum value and a minimum value of a pulse signal according to a control signal indicating that states of some voltages correspond to the limited power state;
• and
• a duty controller limiting a duty range of the pulse signal according to the maximum value and the minimum value from the maximum/minimum value controller,
• wherein the duty controller comprises:
• a comparator comparing a pre-set reference voltage with a detected power state;
• a comparator group including a plurality of comparators comparing a comparison result from the comparator with the maximum value and the minimum value, respectively;
• and
• a switch group including a plurality of switches switching a signal path to provide a corresponding signal according to the comparison result from the comparator and the comparison results from the plurality of comparators of the comparator group.

A multi-output power supply apparatus comprising:

• a power supply unit switching input power to output a first power and a second power whose power levels are determined according to a switching operation;
• and
• a controller detecting a power state of the second power from the power supply unit, and limiting a range of a switching duty of the power supply unit to a pre-set range when the detected power state corresponds to a pre-set limited power state,
• wherein the controller comprises:
• a duty range limiting unit comprising a maximum/minimum value controller setting a maximum value and a minimum value of a pulse signal according to a control signal indicating that states of some voltages correspond to the limited power state;
• and
• a duty controller limiting the duty range of the pulse signal according to the maximum value and the minimum value from the maximum/minimum value controller,
• wherein the maximum/minimum value controller comprises:
• a switch performing a switching to allow a current from a current source to flow;
• a comparator controlling switching of the switch by comparing the control signal with a detection signal obtained by detecting the current flowing in the switch;
• and
• a current mirroring circuit setting the maximum value and the minimum value by mirroring the current flowing from the current source according to the switching of the switch.